Air mattress



FIG. 1 is a perspective view of an air mattress showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left elevational view thereof;

FIG. 5 is a right elevational view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a perspective view of the air mattress showing a state of use thereof.

The broken lines are for environmental purposes only and form no part of the claimed design. 

CLAIM The ornamental design for an air mattress, as shown and described. 